Yep, maybe your CPU is overheating. That will cause a PC to reboot on its own. There's utilities to test this. I've never tried one, but here's a google search:
http://www.google.com/search?q=CPU+t...UTF-8&oe=UTF-8
Though I've never had a message like that when mine rebooted, it just booted up normally. If it is that, there are ways of keeping it cool. Heatsinks, gel, I don't really know the details, but if you google you can find out. You can also get a metal thing to put around your HD that keeps it cool. You might be able to add fans depending on your case. They make some that will fit into one of the external drive bays. Here's a couple sites I bought stuff from at good prices if you need it.
http://www.coolerguys.com/
http://www.xpcgear.com/
Also, have you added any new components lately? If so, is your power supply big enough to handle it? If you're not sending enough power out then things will start failing and eventually the power supply will die.
Since I've gotten a new case with 7 fans and a bigger power supply I haven't had that problem. (Just a 250gb HD FULL of music that won't read after I moved it over
)
And finally, you might want to open the case and blow out any dust that may have collected in your exhaust/intake fans and your CPU fan with a can of air regardless of what it is if you've never done that.
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